linux-kernel - Re: [RFC] [PATCH 4/7] Uprobes Implementation

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Message-ID: <20100115142007.GA1628@linux.vnet.ibm.com>
Date:	Fri, 15 Jan 2010 19:50:07 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Wielaard <mjw@...hat.com>,
	utrace-devel <utrace-devel@...hat.com>
Subject: Re: [RFC] [PATCH 4/7] Uprobes Implementation

> 
> > > Furthermore it requires stopping and resuming tasks and nonsense like
> > > that, that's unwanted in many cases, just run stuff from the trap site
> > > and you're done.
> > 
> > I don't know what you mean exactly.  A trap already stopped task.
> > utrace merely allows various clients to inspect/manipulate the state
> > of the task at that moment.  It does not add any context switches or
> > spurious stop/resumue operations.
> 
> Srikar seemed to suggest it needed stop/resume.
> 

If process traps, We dont need to stop/resume other threads.
uprobes needs threads to quiesce when inserting/deleting the breakpoint.
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